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Effectiveness of ozonation and catalytic ozonation (iron oxide) in the degradation of sunset yellow dye
The Canadian Journal of Chemical Engineering ( IF 2.1 ) Pub Date : 2020-04-23 , DOI: 10.1002/cjce.23770
Cristina Angélica T. Toro 1 , João Luiz A. Dagostin 1 , Érika Castro Vasques 2 , Michele R. Spier 1 , Luciana Igarashi‐Mafra 1 , Tirzhá L. P. Dantas 1
Affiliation  

Azo dyes present in industrial effluents represent a hurdle that regular treatments cannot overcome. In this study, the application of ozone and a catalytic (iron oxide) ozone treatment were proposed as a means of degrading aqueous sunset yellow dye. In order to understand the factors involved, a rotatable central composite design was applied using the variables time, initial dye concentration (C0), pH, ozone inlet concentration (O3), and mass of catalyst, which varied in each case. All variables were significant in colour removal. Extremes in pH, lower C0, and higher ozone concentrations are conditions that favour dye degradation. A complete colour loss occurred for certain combinations of these parameters. The application of iron oxide as a catalyst did not present a satisfactory improvement in the reaction rate. Chemical oxygen demand and total organic carbon showed minimum values of 80% and 78%, respectively, for the worst experimental conditions (pH 7.0, C0 of 45 mg · L−1, and 5 g O3 · m−3), while their values were 88% and 83% for the best conditions applied. There was no immobilization of Artemia salina nauplii, even for the experimental run where the maximum concentration of dye of the set was used (45 mg dye · L−1). Ozonation is a promising alternative in the degradation of aqueous sunset yellow dye, being favoured in acidic or basic media, which is especially important since food effluents usually present low pH and show low toxicity. The mathematical model proposed can be useful in the design of wastewater treatment processes.

中文翻译:

臭氧化和催化臭氧化(氧化铁)对日落黄色染料降解的有效性

工业废水中存在的偶氮染料是常规处理无法克服的障碍。在这项研究中,提出了应用臭氧和催化(氧化铁)臭氧处理作为降解水性日落黄色染料的方法。为了理解所涉及的因素,使用了可变的时间,初始染料浓度(C 0),pH,臭氧入口浓度(O 3)和催化剂质量的可旋转中央复合材料设计,每种情况都不同。所有变量在颜色去除方面均很显着。pH极限,较低的C 0和较高的臭氧浓度是有利于染料降解的条件。这些参数的某些组合发生了完全的颜色损失。氧化铁作为催化剂的应用不能令人满意地提高反应速度。在最坏的实验条件下(pH 7.0,C 0为45 mg·L -1和5 g O 3 ·m -3),化学需氧量和总有机碳的最小值分别为80%和78%。在最佳条件下,它们的值分别为88%和83%。即使使用最大浓度的染料(45 mg染料·L -1)进行实验运行,也没有卤虫无节幼体的固定化。)。臭氧化是降解日落黄色水性染料的一种有前途的替代方法,在酸性或碱性介质中很受青睐,这特别重要,因为食品废水通常呈现低pH值且毒性低。所提出的数学模型可用于废水处理工艺的设计。
更新日期:2020-04-23
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